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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/async.h>
14#include <linux/delay.h>
15#include <linux/dmi.h>
16#include <linux/jiffies.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/slab.h>
22#include <linux/suspend.h>
23#include <linux/types.h>
24
25#include <asm/unaligned.h>
26
27#include <linux/acpi.h>
28#include <linux/power_supply.h>
29
30#include <acpi/battery.h>
31
32#define PREFIX "ACPI: "
33
34#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
35#define ACPI_BATTERY_CAPACITY_VALID(capacity) \
36 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
37
38#define ACPI_BATTERY_DEVICE_NAME "Battery"
39
40/* Battery power unit: 0 means mW, 1 means mA */
41#define ACPI_BATTERY_POWER_UNIT_MA 1
42
43#define ACPI_BATTERY_STATE_DISCHARGING 0x1
44#define ACPI_BATTERY_STATE_CHARGING 0x2
45#define ACPI_BATTERY_STATE_CRITICAL 0x4
46
47#define _COMPONENT ACPI_BATTERY_COMPONENT
48
49ACPI_MODULE_NAME("battery");
50
51MODULE_AUTHOR("Paul Diefenbaugh");
52MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
53MODULE_DESCRIPTION("ACPI Battery Driver");
54MODULE_LICENSE("GPL");
55
56static async_cookie_t async_cookie;
57static bool battery_driver_registered;
58static int battery_bix_broken_package;
59static int battery_notification_delay_ms;
60static int battery_ac_is_broken;
61static int battery_check_pmic = 1;
62static unsigned int cache_time = 1000;
63module_param(cache_time, uint, 0644);
64MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
65
66static const struct acpi_device_id battery_device_ids[] = {
67 {"PNP0C0A", 0},
68 {"", 0},
69};
70
71MODULE_DEVICE_TABLE(acpi, battery_device_ids);
72
73/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
74static const char * const acpi_battery_blacklist[] = {
75 "INT33F4", /* X-Powers AXP288 PMIC */
76};
77
78enum {
79 ACPI_BATTERY_ALARM_PRESENT,
80 ACPI_BATTERY_XINFO_PRESENT,
81 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
82 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
83 switches between mWh and mAh depending on whether the system
84 is running on battery or not. When mAh is the unit, most
85 reported values are incorrect and need to be adjusted by
86 10000/design_voltage. Verified on x201, t410, t410s, and x220.
87 Pre-2010 and 2012 models appear to always report in mWh and
88 are thus unaffected (tested with t42, t61, t500, x200, x300,
89 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
90 the 2011 models that fixes the issue (tested on x220 with a
91 post-1.29 BIOS), but as of Nov. 2012, no such update is
92 available for the 2010 models. */
93 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
94 /* for batteries reporting current capacity with design capacity
95 * on a full charge, but showing degradation in full charge cap.
96 */
97 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
98};
99
100struct acpi_battery {
101 struct mutex lock;
102 struct mutex sysfs_lock;
103 struct power_supply *bat;
104 struct power_supply_desc bat_desc;
105 struct acpi_device *device;
106 struct notifier_block pm_nb;
107 struct list_head list;
108 unsigned long update_time;
109 int revision;
110 int rate_now;
111 int capacity_now;
112 int voltage_now;
113 int design_capacity;
114 int full_charge_capacity;
115 int technology;
116 int design_voltage;
117 int design_capacity_warning;
118 int design_capacity_low;
119 int cycle_count;
120 int measurement_accuracy;
121 int max_sampling_time;
122 int min_sampling_time;
123 int max_averaging_interval;
124 int min_averaging_interval;
125 int capacity_granularity_1;
126 int capacity_granularity_2;
127 int alarm;
128 char model_number[32];
129 char serial_number[32];
130 char type[32];
131 char oem_info[32];
132 int state;
133 int power_unit;
134 unsigned long flags;
135};
136
137#define to_acpi_battery(x) power_supply_get_drvdata(x)
138
139static inline int acpi_battery_present(struct acpi_battery *battery)
140{
141 return battery->device->status.battery_present;
142}
143
144static int acpi_battery_technology(struct acpi_battery *battery)
145{
146 if (!strcasecmp("NiCd", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_NiCd;
148 if (!strcasecmp("NiMH", battery->type))
149 return POWER_SUPPLY_TECHNOLOGY_NiMH;
150 if (!strcasecmp("LION", battery->type))
151 return POWER_SUPPLY_TECHNOLOGY_LION;
152 if (!strncasecmp("LI-ION", battery->type, 6))
153 return POWER_SUPPLY_TECHNOLOGY_LION;
154 if (!strcasecmp("LiP", battery->type))
155 return POWER_SUPPLY_TECHNOLOGY_LIPO;
156 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
157}
158
159static int acpi_battery_get_state(struct acpi_battery *battery);
160
161static int acpi_battery_is_charged(struct acpi_battery *battery)
162{
163 /* charging, discharging or critical low */
164 if (battery->state != 0)
165 return 0;
166
167 /* battery not reporting charge */
168 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
169 battery->capacity_now == 0)
170 return 0;
171
172 /* good batteries update full_charge as the batteries degrade */
173 if (battery->full_charge_capacity == battery->capacity_now)
174 return 1;
175
176 /* fallback to using design values for broken batteries */
177 if (battery->design_capacity == battery->capacity_now)
178 return 1;
179
180 /* we don't do any sort of metric based on percentages */
181 return 0;
182}
183
184static bool acpi_battery_is_degraded(struct acpi_battery *battery)
185{
186 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
187 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
188 battery->full_charge_capacity < battery->design_capacity;
189}
190
191static int acpi_battery_handle_discharging(struct acpi_battery *battery)
192{
193 /*
194 * Some devices wrongly report discharging if the battery's charge level
195 * was above the device's start charging threshold atm the AC adapter
196 * was plugged in and the device thus did not start a new charge cycle.
197 */
198 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
199 battery->rate_now == 0)
200 return POWER_SUPPLY_STATUS_NOT_CHARGING;
201
202 return POWER_SUPPLY_STATUS_DISCHARGING;
203}
204
205static int acpi_battery_get_property(struct power_supply *psy,
206 enum power_supply_property psp,
207 union power_supply_propval *val)
208{
209 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
210 struct acpi_battery *battery = to_acpi_battery(psy);
211
212 if (acpi_battery_present(battery)) {
213 /* run battery update only if it is present */
214 acpi_battery_get_state(battery);
215 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
216 return -ENODEV;
217 switch (psp) {
218 case POWER_SUPPLY_PROP_STATUS:
219 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
220 val->intval = acpi_battery_handle_discharging(battery);
221 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
222 val->intval = POWER_SUPPLY_STATUS_CHARGING;
223 else if (acpi_battery_is_charged(battery))
224 val->intval = POWER_SUPPLY_STATUS_FULL;
225 else
226 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
227 break;
228 case POWER_SUPPLY_PROP_PRESENT:
229 val->intval = acpi_battery_present(battery);
230 break;
231 case POWER_SUPPLY_PROP_TECHNOLOGY:
232 val->intval = acpi_battery_technology(battery);
233 break;
234 case POWER_SUPPLY_PROP_CYCLE_COUNT:
235 val->intval = battery->cycle_count;
236 break;
237 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
238 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
239 ret = -ENODEV;
240 else
241 val->intval = battery->design_voltage * 1000;
242 break;
243 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
244 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
245 ret = -ENODEV;
246 else
247 val->intval = battery->voltage_now * 1000;
248 break;
249 case POWER_SUPPLY_PROP_CURRENT_NOW:
250 case POWER_SUPPLY_PROP_POWER_NOW:
251 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
252 ret = -ENODEV;
253 else
254 val->intval = battery->rate_now * 1000;
255 break;
256 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
257 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
259 ret = -ENODEV;
260 else
261 val->intval = battery->design_capacity * 1000;
262 break;
263 case POWER_SUPPLY_PROP_CHARGE_FULL:
264 case POWER_SUPPLY_PROP_ENERGY_FULL:
265 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
266 ret = -ENODEV;
267 else
268 val->intval = battery->full_charge_capacity * 1000;
269 break;
270 case POWER_SUPPLY_PROP_CHARGE_NOW:
271 case POWER_SUPPLY_PROP_ENERGY_NOW:
272 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
273 ret = -ENODEV;
274 else
275 val->intval = battery->capacity_now * 1000;
276 break;
277 case POWER_SUPPLY_PROP_CAPACITY:
278 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
279 full_capacity = battery->full_charge_capacity;
280 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
281 full_capacity = battery->design_capacity;
282
283 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
284 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
285 ret = -ENODEV;
286 else
287 val->intval = battery->capacity_now * 100/
288 full_capacity;
289 break;
290 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
291 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
293 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
294 (battery->capacity_now <= battery->alarm))
295 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
296 else if (acpi_battery_is_charged(battery))
297 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
298 else
299 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
300 break;
301 case POWER_SUPPLY_PROP_MODEL_NAME:
302 val->strval = battery->model_number;
303 break;
304 case POWER_SUPPLY_PROP_MANUFACTURER:
305 val->strval = battery->oem_info;
306 break;
307 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
308 val->strval = battery->serial_number;
309 break;
310 default:
311 ret = -EINVAL;
312 }
313 return ret;
314}
315
316static enum power_supply_property charge_battery_props[] = {
317 POWER_SUPPLY_PROP_STATUS,
318 POWER_SUPPLY_PROP_PRESENT,
319 POWER_SUPPLY_PROP_TECHNOLOGY,
320 POWER_SUPPLY_PROP_CYCLE_COUNT,
321 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
322 POWER_SUPPLY_PROP_VOLTAGE_NOW,
323 POWER_SUPPLY_PROP_CURRENT_NOW,
324 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
325 POWER_SUPPLY_PROP_CHARGE_FULL,
326 POWER_SUPPLY_PROP_CHARGE_NOW,
327 POWER_SUPPLY_PROP_CAPACITY,
328 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
329 POWER_SUPPLY_PROP_MODEL_NAME,
330 POWER_SUPPLY_PROP_MANUFACTURER,
331 POWER_SUPPLY_PROP_SERIAL_NUMBER,
332};
333
334static enum power_supply_property charge_battery_full_cap_broken_props[] = {
335 POWER_SUPPLY_PROP_STATUS,
336 POWER_SUPPLY_PROP_PRESENT,
337 POWER_SUPPLY_PROP_TECHNOLOGY,
338 POWER_SUPPLY_PROP_CYCLE_COUNT,
339 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
340 POWER_SUPPLY_PROP_VOLTAGE_NOW,
341 POWER_SUPPLY_PROP_CURRENT_NOW,
342 POWER_SUPPLY_PROP_CHARGE_NOW,
343 POWER_SUPPLY_PROP_MODEL_NAME,
344 POWER_SUPPLY_PROP_MANUFACTURER,
345 POWER_SUPPLY_PROP_SERIAL_NUMBER,
346};
347
348static enum power_supply_property energy_battery_props[] = {
349 POWER_SUPPLY_PROP_STATUS,
350 POWER_SUPPLY_PROP_PRESENT,
351 POWER_SUPPLY_PROP_TECHNOLOGY,
352 POWER_SUPPLY_PROP_CYCLE_COUNT,
353 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
354 POWER_SUPPLY_PROP_VOLTAGE_NOW,
355 POWER_SUPPLY_PROP_POWER_NOW,
356 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
357 POWER_SUPPLY_PROP_ENERGY_FULL,
358 POWER_SUPPLY_PROP_ENERGY_NOW,
359 POWER_SUPPLY_PROP_CAPACITY,
360 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
361 POWER_SUPPLY_PROP_MODEL_NAME,
362 POWER_SUPPLY_PROP_MANUFACTURER,
363 POWER_SUPPLY_PROP_SERIAL_NUMBER,
364};
365
366static enum power_supply_property energy_battery_full_cap_broken_props[] = {
367 POWER_SUPPLY_PROP_STATUS,
368 POWER_SUPPLY_PROP_PRESENT,
369 POWER_SUPPLY_PROP_TECHNOLOGY,
370 POWER_SUPPLY_PROP_CYCLE_COUNT,
371 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
372 POWER_SUPPLY_PROP_VOLTAGE_NOW,
373 POWER_SUPPLY_PROP_POWER_NOW,
374 POWER_SUPPLY_PROP_ENERGY_NOW,
375 POWER_SUPPLY_PROP_MODEL_NAME,
376 POWER_SUPPLY_PROP_MANUFACTURER,
377 POWER_SUPPLY_PROP_SERIAL_NUMBER,
378};
379
380/* --------------------------------------------------------------------------
381 Battery Management
382 -------------------------------------------------------------------------- */
383struct acpi_offsets {
384 size_t offset; /* offset inside struct acpi_sbs_battery */
385 u8 mode; /* int or string? */
386};
387
388static const struct acpi_offsets state_offsets[] = {
389 {offsetof(struct acpi_battery, state), 0},
390 {offsetof(struct acpi_battery, rate_now), 0},
391 {offsetof(struct acpi_battery, capacity_now), 0},
392 {offsetof(struct acpi_battery, voltage_now), 0},
393};
394
395static const struct acpi_offsets info_offsets[] = {
396 {offsetof(struct acpi_battery, power_unit), 0},
397 {offsetof(struct acpi_battery, design_capacity), 0},
398 {offsetof(struct acpi_battery, full_charge_capacity), 0},
399 {offsetof(struct acpi_battery, technology), 0},
400 {offsetof(struct acpi_battery, design_voltage), 0},
401 {offsetof(struct acpi_battery, design_capacity_warning), 0},
402 {offsetof(struct acpi_battery, design_capacity_low), 0},
403 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
404 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
405 {offsetof(struct acpi_battery, model_number), 1},
406 {offsetof(struct acpi_battery, serial_number), 1},
407 {offsetof(struct acpi_battery, type), 1},
408 {offsetof(struct acpi_battery, oem_info), 1},
409};
410
411static const struct acpi_offsets extended_info_offsets[] = {
412 {offsetof(struct acpi_battery, revision), 0},
413 {offsetof(struct acpi_battery, power_unit), 0},
414 {offsetof(struct acpi_battery, design_capacity), 0},
415 {offsetof(struct acpi_battery, full_charge_capacity), 0},
416 {offsetof(struct acpi_battery, technology), 0},
417 {offsetof(struct acpi_battery, design_voltage), 0},
418 {offsetof(struct acpi_battery, design_capacity_warning), 0},
419 {offsetof(struct acpi_battery, design_capacity_low), 0},
420 {offsetof(struct acpi_battery, cycle_count), 0},
421 {offsetof(struct acpi_battery, measurement_accuracy), 0},
422 {offsetof(struct acpi_battery, max_sampling_time), 0},
423 {offsetof(struct acpi_battery, min_sampling_time), 0},
424 {offsetof(struct acpi_battery, max_averaging_interval), 0},
425 {offsetof(struct acpi_battery, min_averaging_interval), 0},
426 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
427 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
428 {offsetof(struct acpi_battery, model_number), 1},
429 {offsetof(struct acpi_battery, serial_number), 1},
430 {offsetof(struct acpi_battery, type), 1},
431 {offsetof(struct acpi_battery, oem_info), 1},
432};
433
434static int extract_package(struct acpi_battery *battery,
435 union acpi_object *package,
436 const struct acpi_offsets *offsets, int num)
437{
438 int i;
439 union acpi_object *element;
440 if (package->type != ACPI_TYPE_PACKAGE)
441 return -EFAULT;
442 for (i = 0; i < num; ++i) {
443 if (package->package.count <= i)
444 return -EFAULT;
445 element = &package->package.elements[i];
446 if (offsets[i].mode) {
447 u8 *ptr = (u8 *)battery + offsets[i].offset;
448 if (element->type == ACPI_TYPE_STRING ||
449 element->type == ACPI_TYPE_BUFFER)
450 strncpy(ptr, element->string.pointer, 32);
451 else if (element->type == ACPI_TYPE_INTEGER) {
452 strncpy(ptr, (u8 *)&element->integer.value,
453 sizeof(u64));
454 ptr[sizeof(u64)] = 0;
455 } else
456 *ptr = 0; /* don't have value */
457 } else {
458 int *x = (int *)((u8 *)battery + offsets[i].offset);
459 *x = (element->type == ACPI_TYPE_INTEGER) ?
460 element->integer.value : -1;
461 }
462 }
463 return 0;
464}
465
466static int acpi_battery_get_status(struct acpi_battery *battery)
467{
468 if (acpi_bus_get_status(battery->device)) {
469 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
470 return -ENODEV;
471 }
472 return 0;
473}
474
475
476static int extract_battery_info(const int use_bix,
477 struct acpi_battery *battery,
478 const struct acpi_buffer *buffer)
479{
480 int result = -EFAULT;
481
482 if (use_bix && battery_bix_broken_package)
483 result = extract_package(battery, buffer->pointer,
484 extended_info_offsets + 1,
485 ARRAY_SIZE(extended_info_offsets) - 1);
486 else if (use_bix)
487 result = extract_package(battery, buffer->pointer,
488 extended_info_offsets,
489 ARRAY_SIZE(extended_info_offsets));
490 else
491 result = extract_package(battery, buffer->pointer,
492 info_offsets, ARRAY_SIZE(info_offsets));
493 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
494 battery->full_charge_capacity = battery->design_capacity;
495 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
496 battery->power_unit && battery->design_voltage) {
497 battery->design_capacity = battery->design_capacity *
498 10000 / battery->design_voltage;
499 battery->full_charge_capacity = battery->full_charge_capacity *
500 10000 / battery->design_voltage;
501 battery->design_capacity_warning =
502 battery->design_capacity_warning *
503 10000 / battery->design_voltage;
504 /* Curiously, design_capacity_low, unlike the rest of them,
505 is correct. */
506 /* capacity_granularity_* equal 1 on the systems tested, so
507 it's impossible to tell if they would need an adjustment
508 or not if their values were higher. */
509 }
510 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
511 battery->capacity_now > battery->full_charge_capacity)
512 battery->capacity_now = battery->full_charge_capacity;
513
514 return result;
515}
516
517static int acpi_battery_get_info(struct acpi_battery *battery)
518{
519 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
520 int use_bix;
521 int result = -ENODEV;
522
523 if (!acpi_battery_present(battery))
524 return 0;
525
526
527 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
528 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
529 acpi_status status = AE_ERROR;
530
531 mutex_lock(&battery->lock);
532 status = acpi_evaluate_object(battery->device->handle,
533 use_bix ? "_BIX":"_BIF",
534 NULL, &buffer);
535 mutex_unlock(&battery->lock);
536
537 if (ACPI_FAILURE(status)) {
538 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s",
539 use_bix ? "_BIX":"_BIF"));
540 } else {
541 result = extract_battery_info(use_bix,
542 battery,
543 &buffer);
544
545 kfree(buffer.pointer);
546 break;
547 }
548 }
549
550 if (!result && !use_bix && xinfo)
551 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
552
553 return result;
554}
555
556static int acpi_battery_get_state(struct acpi_battery *battery)
557{
558 int result = 0;
559 acpi_status status = 0;
560 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
561
562 if (!acpi_battery_present(battery))
563 return 0;
564
565 if (battery->update_time &&
566 time_before(jiffies, battery->update_time +
567 msecs_to_jiffies(cache_time)))
568 return 0;
569
570 mutex_lock(&battery->lock);
571 status = acpi_evaluate_object(battery->device->handle, "_BST",
572 NULL, &buffer);
573 mutex_unlock(&battery->lock);
574
575 if (ACPI_FAILURE(status)) {
576 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
577 return -ENODEV;
578 }
579
580 result = extract_package(battery, buffer.pointer,
581 state_offsets, ARRAY_SIZE(state_offsets));
582 battery->update_time = jiffies;
583 kfree(buffer.pointer);
584
585 /* For buggy DSDTs that report negative 16-bit values for either
586 * charging or discharging current and/or report 0 as 65536
587 * due to bad math.
588 */
589 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
590 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
591 (s16)(battery->rate_now) < 0) {
592 battery->rate_now = abs((s16)battery->rate_now);
593 pr_warn_once(FW_BUG "battery: (dis)charge rate invalid.\n");
594 }
595
596 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
597 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
598 battery->capacity_now = (battery->capacity_now *
599 battery->full_charge_capacity) / 100;
600 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
601 battery->power_unit && battery->design_voltage) {
602 battery->capacity_now = battery->capacity_now *
603 10000 / battery->design_voltage;
604 }
605 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
606 battery->capacity_now > battery->full_charge_capacity)
607 battery->capacity_now = battery->full_charge_capacity;
608
609 return result;
610}
611
612static int acpi_battery_set_alarm(struct acpi_battery *battery)
613{
614 acpi_status status = 0;
615
616 if (!acpi_battery_present(battery) ||
617 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
618 return -ENODEV;
619
620 mutex_lock(&battery->lock);
621 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
622 battery->alarm);
623 mutex_unlock(&battery->lock);
624
625 if (ACPI_FAILURE(status))
626 return -ENODEV;
627
628 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
629 return 0;
630}
631
632static int acpi_battery_init_alarm(struct acpi_battery *battery)
633{
634 /* See if alarms are supported, and if so, set default */
635 if (!acpi_has_method(battery->device->handle, "_BTP")) {
636 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
637 return 0;
638 }
639 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
640 if (!battery->alarm)
641 battery->alarm = battery->design_capacity_warning;
642 return acpi_battery_set_alarm(battery);
643}
644
645static ssize_t acpi_battery_alarm_show(struct device *dev,
646 struct device_attribute *attr,
647 char *buf)
648{
649 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
650 return sprintf(buf, "%d\n", battery->alarm * 1000);
651}
652
653static ssize_t acpi_battery_alarm_store(struct device *dev,
654 struct device_attribute *attr,
655 const char *buf, size_t count)
656{
657 unsigned long x;
658 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
659 if (sscanf(buf, "%lu\n", &x) == 1)
660 battery->alarm = x/1000;
661 if (acpi_battery_present(battery))
662 acpi_battery_set_alarm(battery);
663 return count;
664}
665
666static const struct device_attribute alarm_attr = {
667 .attr = {.name = "alarm", .mode = 0644},
668 .show = acpi_battery_alarm_show,
669 .store = acpi_battery_alarm_store,
670};
671
672/*
673 * The Battery Hooking API
674 *
675 * This API is used inside other drivers that need to expose
676 * platform-specific behaviour within the generic driver in a
677 * generic way.
678 *
679 */
680
681static LIST_HEAD(acpi_battery_list);
682static LIST_HEAD(battery_hook_list);
683static DEFINE_MUTEX(hook_mutex);
684
685static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
686{
687 struct acpi_battery *battery;
688 /*
689 * In order to remove a hook, we first need to
690 * de-register all the batteries that are registered.
691 */
692 if (lock)
693 mutex_lock(&hook_mutex);
694 list_for_each_entry(battery, &acpi_battery_list, list) {
695 hook->remove_battery(battery->bat);
696 }
697 list_del(&hook->list);
698 if (lock)
699 mutex_unlock(&hook_mutex);
700 pr_info("extension unregistered: %s\n", hook->name);
701}
702
703void battery_hook_unregister(struct acpi_battery_hook *hook)
704{
705 __battery_hook_unregister(hook, 1);
706}
707EXPORT_SYMBOL_GPL(battery_hook_unregister);
708
709void battery_hook_register(struct acpi_battery_hook *hook)
710{
711 struct acpi_battery *battery;
712
713 mutex_lock(&hook_mutex);
714 INIT_LIST_HEAD(&hook->list);
715 list_add(&hook->list, &battery_hook_list);
716 /*
717 * Now that the driver is registered, we need
718 * to notify the hook that a battery is available
719 * for each battery, so that the driver may add
720 * its attributes.
721 */
722 list_for_each_entry(battery, &acpi_battery_list, list) {
723 if (hook->add_battery(battery->bat)) {
724 /*
725 * If a add-battery returns non-zero,
726 * the registration of the extension has failed,
727 * and we will not add it to the list of loaded
728 * hooks.
729 */
730 pr_err("extension failed to load: %s", hook->name);
731 __battery_hook_unregister(hook, 0);
732 goto end;
733 }
734 }
735 pr_info("new extension: %s\n", hook->name);
736end:
737 mutex_unlock(&hook_mutex);
738}
739EXPORT_SYMBOL_GPL(battery_hook_register);
740
741/*
742 * This function gets called right after the battery sysfs
743 * attributes have been added, so that the drivers that
744 * define custom sysfs attributes can add their own.
745*/
746static void battery_hook_add_battery(struct acpi_battery *battery)
747{
748 struct acpi_battery_hook *hook_node, *tmp;
749
750 mutex_lock(&hook_mutex);
751 INIT_LIST_HEAD(&battery->list);
752 list_add(&battery->list, &acpi_battery_list);
753 /*
754 * Since we added a new battery to the list, we need to
755 * iterate over the hooks and call add_battery for each
756 * hook that was registered. This usually happens
757 * when a battery gets hotplugged or initialized
758 * during the battery module initialization.
759 */
760 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
761 if (hook_node->add_battery(battery->bat)) {
762 /*
763 * The notification of the extensions has failed, to
764 * prevent further errors we will unload the extension.
765 */
766 pr_err("error in extension, unloading: %s",
767 hook_node->name);
768 __battery_hook_unregister(hook_node, 0);
769 }
770 }
771 mutex_unlock(&hook_mutex);
772}
773
774static void battery_hook_remove_battery(struct acpi_battery *battery)
775{
776 struct acpi_battery_hook *hook;
777
778 mutex_lock(&hook_mutex);
779 /*
780 * Before removing the hook, we need to remove all
781 * custom attributes from the battery.
782 */
783 list_for_each_entry(hook, &battery_hook_list, list) {
784 hook->remove_battery(battery->bat);
785 }
786 /* Then, just remove the battery from the list */
787 list_del(&battery->list);
788 mutex_unlock(&hook_mutex);
789}
790
791static void __exit battery_hook_exit(void)
792{
793 struct acpi_battery_hook *hook;
794 struct acpi_battery_hook *ptr;
795 /*
796 * At this point, the acpi_bus_unregister_driver()
797 * has called remove for all batteries. We just
798 * need to remove the hooks.
799 */
800 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
801 __battery_hook_unregister(hook, 1);
802 }
803 mutex_destroy(&hook_mutex);
804}
805
806static int sysfs_add_battery(struct acpi_battery *battery)
807{
808 struct power_supply_config psy_cfg = { .drv_data = battery, };
809 bool full_cap_broken = false;
810
811 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
812 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
813 full_cap_broken = true;
814
815 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
816 if (full_cap_broken) {
817 battery->bat_desc.properties =
818 charge_battery_full_cap_broken_props;
819 battery->bat_desc.num_properties =
820 ARRAY_SIZE(charge_battery_full_cap_broken_props);
821 } else {
822 battery->bat_desc.properties = charge_battery_props;
823 battery->bat_desc.num_properties =
824 ARRAY_SIZE(charge_battery_props);
825 }
826 } else {
827 if (full_cap_broken) {
828 battery->bat_desc.properties =
829 energy_battery_full_cap_broken_props;
830 battery->bat_desc.num_properties =
831 ARRAY_SIZE(energy_battery_full_cap_broken_props);
832 } else {
833 battery->bat_desc.properties = energy_battery_props;
834 battery->bat_desc.num_properties =
835 ARRAY_SIZE(energy_battery_props);
836 }
837 }
838
839 battery->bat_desc.name = acpi_device_bid(battery->device);
840 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
841 battery->bat_desc.get_property = acpi_battery_get_property;
842
843 battery->bat = power_supply_register_no_ws(&battery->device->dev,
844 &battery->bat_desc, &psy_cfg);
845
846 if (IS_ERR(battery->bat)) {
847 int result = PTR_ERR(battery->bat);
848
849 battery->bat = NULL;
850 return result;
851 }
852 battery_hook_add_battery(battery);
853 return device_create_file(&battery->bat->dev, &alarm_attr);
854}
855
856static void sysfs_remove_battery(struct acpi_battery *battery)
857{
858 mutex_lock(&battery->sysfs_lock);
859 if (!battery->bat) {
860 mutex_unlock(&battery->sysfs_lock);
861 return;
862 }
863 battery_hook_remove_battery(battery);
864 device_remove_file(&battery->bat->dev, &alarm_attr);
865 power_supply_unregister(battery->bat);
866 battery->bat = NULL;
867 mutex_unlock(&battery->sysfs_lock);
868}
869
870static void find_battery(const struct dmi_header *dm, void *private)
871{
872 struct acpi_battery *battery = (struct acpi_battery *)private;
873 /* Note: the hardcoded offsets below have been extracted from
874 the source code of dmidecode. */
875 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
876 const u8 *dmi_data = (const u8 *)(dm + 1);
877 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
878 if (dm->length >= 18)
879 dmi_capacity *= dmi_data[17];
880 if (battery->design_capacity * battery->design_voltage / 1000
881 != dmi_capacity &&
882 battery->design_capacity * 10 == dmi_capacity)
883 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
884 &battery->flags);
885 }
886}
887
888/*
889 * According to the ACPI spec, some kinds of primary batteries can
890 * report percentage battery remaining capacity directly to OS.
891 * In this case, it reports the Last Full Charged Capacity == 100
892 * and BatteryPresentRate == 0xFFFFFFFF.
893 *
894 * Now we found some battery reports percentage remaining capacity
895 * even if it's rechargeable.
896 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
897 *
898 * Handle this correctly so that they won't break userspace.
899 */
900static void acpi_battery_quirks(struct acpi_battery *battery)
901{
902 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
903 return;
904
905 if (battery->full_charge_capacity == 100 &&
906 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
907 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
908 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
909 battery->full_charge_capacity = battery->design_capacity;
910 battery->capacity_now = (battery->capacity_now *
911 battery->full_charge_capacity) / 100;
912 }
913
914 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
915 return;
916
917 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
918 const char *s;
919 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
920 if (s && !strncasecmp(s, "ThinkPad", 8)) {
921 dmi_walk(find_battery, battery);
922 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
923 &battery->flags) &&
924 battery->design_voltage) {
925 battery->design_capacity =
926 battery->design_capacity *
927 10000 / battery->design_voltage;
928 battery->full_charge_capacity =
929 battery->full_charge_capacity *
930 10000 / battery->design_voltage;
931 battery->design_capacity_warning =
932 battery->design_capacity_warning *
933 10000 / battery->design_voltage;
934 battery->capacity_now = battery->capacity_now *
935 10000 / battery->design_voltage;
936 }
937 }
938 }
939
940 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
941 return;
942
943 if (acpi_battery_is_degraded(battery) &&
944 battery->capacity_now > battery->full_charge_capacity) {
945 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
946 battery->capacity_now = battery->full_charge_capacity;
947 }
948}
949
950static int acpi_battery_update(struct acpi_battery *battery, bool resume)
951{
952 int result = acpi_battery_get_status(battery);
953
954 if (result)
955 return result;
956
957 if (!acpi_battery_present(battery)) {
958 sysfs_remove_battery(battery);
959 battery->update_time = 0;
960 return 0;
961 }
962
963 if (resume)
964 return 0;
965
966 if (!battery->update_time) {
967 result = acpi_battery_get_info(battery);
968 if (result)
969 return result;
970 acpi_battery_init_alarm(battery);
971 }
972
973 result = acpi_battery_get_state(battery);
974 if (result)
975 return result;
976 acpi_battery_quirks(battery);
977
978 if (!battery->bat) {
979 result = sysfs_add_battery(battery);
980 if (result)
981 return result;
982 }
983
984 /*
985 * Wakeup the system if battery is critical low
986 * or lower than the alarm level
987 */
988 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
989 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
990 (battery->capacity_now <= battery->alarm)))
991 acpi_pm_wakeup_event(&battery->device->dev);
992
993 return result;
994}
995
996static void acpi_battery_refresh(struct acpi_battery *battery)
997{
998 int power_unit;
999
1000 if (!battery->bat)
1001 return;
1002
1003 power_unit = battery->power_unit;
1004
1005 acpi_battery_get_info(battery);
1006
1007 if (power_unit == battery->power_unit)
1008 return;
1009
1010 /* The battery has changed its reporting units. */
1011 sysfs_remove_battery(battery);
1012 sysfs_add_battery(battery);
1013}
1014
1015/* --------------------------------------------------------------------------
1016 Driver Interface
1017 -------------------------------------------------------------------------- */
1018
1019static void acpi_battery_notify(struct acpi_device *device, u32 event)
1020{
1021 struct acpi_battery *battery = acpi_driver_data(device);
1022 struct power_supply *old;
1023
1024 if (!battery)
1025 return;
1026 old = battery->bat;
1027 /*
1028 * On Acer Aspire V5-573G notifications are sometimes triggered too
1029 * early. For example, when AC is unplugged and notification is
1030 * triggered, battery state is still reported as "Full", and changes to
1031 * "Discharging" only after short delay, without any notification.
1032 */
1033 if (battery_notification_delay_ms > 0)
1034 msleep(battery_notification_delay_ms);
1035 if (event == ACPI_BATTERY_NOTIFY_INFO)
1036 acpi_battery_refresh(battery);
1037 acpi_battery_update(battery, false);
1038 acpi_bus_generate_netlink_event(device->pnp.device_class,
1039 dev_name(&device->dev), event,
1040 acpi_battery_present(battery));
1041 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1042 /* acpi_battery_update could remove power_supply object */
1043 if (old && battery->bat)
1044 power_supply_changed(battery->bat);
1045}
1046
1047static int battery_notify(struct notifier_block *nb,
1048 unsigned long mode, void *_unused)
1049{
1050 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1051 pm_nb);
1052 int result;
1053
1054 switch (mode) {
1055 case PM_POST_HIBERNATION:
1056 case PM_POST_SUSPEND:
1057 if (!acpi_battery_present(battery))
1058 return 0;
1059
1060 if (battery->bat) {
1061 acpi_battery_refresh(battery);
1062 } else {
1063 result = acpi_battery_get_info(battery);
1064 if (result)
1065 return result;
1066
1067 result = sysfs_add_battery(battery);
1068 if (result)
1069 return result;
1070 }
1071
1072 acpi_battery_init_alarm(battery);
1073 acpi_battery_get_state(battery);
1074 break;
1075 }
1076
1077 return 0;
1078}
1079
1080static int __init
1081battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1082{
1083 battery_bix_broken_package = 1;
1084 return 0;
1085}
1086
1087static int __init
1088battery_notification_delay_quirk(const struct dmi_system_id *d)
1089{
1090 battery_notification_delay_ms = 1000;
1091 return 0;
1092}
1093
1094static int __init
1095battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1096{
1097 battery_ac_is_broken = 1;
1098 return 0;
1099}
1100
1101static int __init
1102battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
1103{
1104 battery_check_pmic = 0;
1105 return 0;
1106}
1107
1108static const struct dmi_system_id bat_dmi_table[] __initconst = {
1109 {
1110 /* NEC LZ750/LS */
1111 .callback = battery_bix_broken_package_quirk,
1112 .matches = {
1113 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1114 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1115 },
1116 },
1117 {
1118 /* Acer Aspire V5-573G */
1119 .callback = battery_notification_delay_quirk,
1120 .matches = {
1121 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1122 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1123 },
1124 },
1125 {
1126 /* Point of View mobii wintab p800w */
1127 .callback = battery_ac_is_broken_quirk,
1128 .matches = {
1129 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1130 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1131 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1132 /* Above matches are too generic, add bios-date match */
1133 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1134 },
1135 },
1136 {
1137 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
1138 .callback = battery_do_not_check_pmic_quirk,
1139 .matches = {
1140 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
1141 },
1142 },
1143 {
1144 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
1145 .callback = battery_do_not_check_pmic_quirk,
1146 .matches = {
1147 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1148 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
1149 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
1150 },
1151 },
1152 {},
1153};
1154
1155/*
1156 * Some machines'(E,G Lenovo Z480) ECs are not stable
1157 * during boot up and this causes battery driver fails to be
1158 * probed due to failure of getting battery information
1159 * from EC sometimes. After several retries, the operation
1160 * may work. So add retry code here and 20ms sleep between
1161 * every retries.
1162 */
1163static int acpi_battery_update_retry(struct acpi_battery *battery)
1164{
1165 int retry, ret;
1166
1167 for (retry = 5; retry; retry--) {
1168 ret = acpi_battery_update(battery, false);
1169 if (!ret)
1170 break;
1171
1172 msleep(20);
1173 }
1174 return ret;
1175}
1176
1177static int acpi_battery_add(struct acpi_device *device)
1178{
1179 int result = 0;
1180 struct acpi_battery *battery = NULL;
1181
1182 if (!device)
1183 return -EINVAL;
1184
1185 if (device->dep_unmet)
1186 return -EPROBE_DEFER;
1187
1188 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1189 if (!battery)
1190 return -ENOMEM;
1191 battery->device = device;
1192 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1193 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1194 device->driver_data = battery;
1195 mutex_init(&battery->lock);
1196 mutex_init(&battery->sysfs_lock);
1197 if (acpi_has_method(battery->device->handle, "_BIX"))
1198 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1199
1200 result = acpi_battery_update_retry(battery);
1201 if (result)
1202 goto fail;
1203
1204 pr_info(PREFIX "%s Slot [%s] (battery %s)\n",
1205 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1206 device->status.battery_present ? "present" : "absent");
1207
1208 battery->pm_nb.notifier_call = battery_notify;
1209 register_pm_notifier(&battery->pm_nb);
1210
1211 device_init_wakeup(&device->dev, 1);
1212
1213 return result;
1214
1215fail:
1216 sysfs_remove_battery(battery);
1217 mutex_destroy(&battery->lock);
1218 mutex_destroy(&battery->sysfs_lock);
1219 kfree(battery);
1220 return result;
1221}
1222
1223static int acpi_battery_remove(struct acpi_device *device)
1224{
1225 struct acpi_battery *battery = NULL;
1226
1227 if (!device || !acpi_driver_data(device))
1228 return -EINVAL;
1229 device_init_wakeup(&device->dev, 0);
1230 battery = acpi_driver_data(device);
1231 unregister_pm_notifier(&battery->pm_nb);
1232 sysfs_remove_battery(battery);
1233 mutex_destroy(&battery->lock);
1234 mutex_destroy(&battery->sysfs_lock);
1235 kfree(battery);
1236 return 0;
1237}
1238
1239#ifdef CONFIG_PM_SLEEP
1240/* this is needed to learn about changes made in suspended state */
1241static int acpi_battery_resume(struct device *dev)
1242{
1243 struct acpi_battery *battery;
1244
1245 if (!dev)
1246 return -EINVAL;
1247
1248 battery = acpi_driver_data(to_acpi_device(dev));
1249 if (!battery)
1250 return -EINVAL;
1251
1252 battery->update_time = 0;
1253 acpi_battery_update(battery, true);
1254 return 0;
1255}
1256#else
1257#define acpi_battery_resume NULL
1258#endif
1259
1260static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1261
1262static struct acpi_driver acpi_battery_driver = {
1263 .name = "battery",
1264 .class = ACPI_BATTERY_CLASS,
1265 .ids = battery_device_ids,
1266 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1267 .ops = {
1268 .add = acpi_battery_add,
1269 .remove = acpi_battery_remove,
1270 .notify = acpi_battery_notify,
1271 },
1272 .drv.pm = &acpi_battery_pm,
1273};
1274
1275static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1276{
1277 unsigned int i;
1278 int result;
1279
1280 dmi_check_system(bat_dmi_table);
1281
1282 if (battery_check_pmic) {
1283 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
1284 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
1285 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
1286 ": found native %s PMIC, not loading\n",
1287 acpi_battery_blacklist[i]);
1288 return;
1289 }
1290 }
1291
1292 result = acpi_bus_register_driver(&acpi_battery_driver);
1293 battery_driver_registered = (result == 0);
1294}
1295
1296static int __init acpi_battery_init(void)
1297{
1298 if (acpi_disabled)
1299 return -ENODEV;
1300
1301 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1302 return 0;
1303}
1304
1305static void __exit acpi_battery_exit(void)
1306{
1307 async_synchronize_cookie(async_cookie + 1);
1308 if (battery_driver_registered) {
1309 acpi_bus_unregister_driver(&acpi_battery_driver);
1310 battery_hook_exit();
1311 }
1312}
1313
1314module_init(acpi_battery_init);
1315module_exit(acpi_battery_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) "ACPI: battery: " fmt
12
13#include <linux/async.h>
14#include <linux/delay.h>
15#include <linux/dmi.h>
16#include <linux/jiffies.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/slab.h>
22#include <linux/suspend.h>
23#include <linux/types.h>
24
25#include <asm/unaligned.h>
26
27#include <linux/acpi.h>
28#include <linux/power_supply.h>
29
30#include <acpi/battery.h>
31
32#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
33#define ACPI_BATTERY_CAPACITY_VALID(capacity) \
34 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
35
36#define ACPI_BATTERY_DEVICE_NAME "Battery"
37
38/* Battery power unit: 0 means mW, 1 means mA */
39#define ACPI_BATTERY_POWER_UNIT_MA 1
40
41#define ACPI_BATTERY_STATE_DISCHARGING 0x1
42#define ACPI_BATTERY_STATE_CHARGING 0x2
43#define ACPI_BATTERY_STATE_CRITICAL 0x4
44
45MODULE_AUTHOR("Paul Diefenbaugh");
46MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
47MODULE_DESCRIPTION("ACPI Battery Driver");
48MODULE_LICENSE("GPL");
49
50static async_cookie_t async_cookie;
51static bool battery_driver_registered;
52static int battery_bix_broken_package;
53static int battery_notification_delay_ms;
54static int battery_ac_is_broken;
55static unsigned int cache_time = 1000;
56module_param(cache_time, uint, 0644);
57MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
58
59static const struct acpi_device_id battery_device_ids[] = {
60 {"PNP0C0A", 0},
61
62 /* Microsoft Surface Go 3 */
63 {"MSHW0146", 0},
64
65 {"", 0},
66};
67
68MODULE_DEVICE_TABLE(acpi, battery_device_ids);
69
70enum {
71 ACPI_BATTERY_ALARM_PRESENT,
72 ACPI_BATTERY_XINFO_PRESENT,
73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
75 * switches between mWh and mAh depending on whether the system
76 * is running on battery or not. When mAh is the unit, most
77 * reported values are incorrect and need to be adjusted by
78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
79 * Pre-2010 and 2012 models appear to always report in mWh and
80 * are thus unaffected (tested with t42, t61, t500, x200, x300,
81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
82 * the 2011 models that fixes the issue (tested on x220 with a
83 * post-1.29 BIOS), but as of Nov. 2012, no such update is
84 * available for the 2010 models.
85 */
86 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
87 /* for batteries reporting current capacity with design capacity
88 * on a full charge, but showing degradation in full charge cap.
89 */
90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
91};
92
93struct acpi_battery {
94 struct mutex lock;
95 struct mutex sysfs_lock;
96 struct power_supply *bat;
97 struct power_supply_desc bat_desc;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 struct list_head list;
101 unsigned long update_time;
102 int revision;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int cycle_count;
113 int measurement_accuracy;
114 int max_sampling_time;
115 int min_sampling_time;
116 int max_averaging_interval;
117 int min_averaging_interval;
118 int capacity_granularity_1;
119 int capacity_granularity_2;
120 int alarm;
121 char model_number[32];
122 char serial_number[32];
123 char type[32];
124 char oem_info[32];
125 int state;
126 int power_unit;
127 unsigned long flags;
128};
129
130#define to_acpi_battery(x) power_supply_get_drvdata(x)
131
132static inline int acpi_battery_present(struct acpi_battery *battery)
133{
134 return battery->device->status.battery_present;
135}
136
137static int acpi_battery_technology(struct acpi_battery *battery)
138{
139 if (!strcasecmp("NiCd", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiCd;
141 if (!strcasecmp("NiMH", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiMH;
143 if (!strcasecmp("LION", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strncasecmp("LI-ION", battery->type, 6))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strcasecmp("LiP", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LIPO;
149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
150}
151
152static int acpi_battery_get_state(struct acpi_battery *battery);
153
154static int acpi_battery_is_charged(struct acpi_battery *battery)
155{
156 /* charging, discharging or critical low */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175}
176
177static bool acpi_battery_is_degraded(struct acpi_battery *battery)
178{
179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
181 battery->full_charge_capacity < battery->design_capacity;
182}
183
184static int acpi_battery_handle_discharging(struct acpi_battery *battery)
185{
186 /*
187 * Some devices wrongly report discharging if the battery's charge level
188 * was above the device's start charging threshold atm the AC adapter
189 * was plugged in and the device thus did not start a new charge cycle.
190 */
191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
192 battery->rate_now == 0)
193 return POWER_SUPPLY_STATUS_NOT_CHARGING;
194
195 return POWER_SUPPLY_STATUS_DISCHARGING;
196}
197
198static int acpi_battery_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201{
202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
203 struct acpi_battery *battery = to_acpi_battery(psy);
204
205 if (acpi_battery_present(battery)) {
206 /* run battery update only if it is present */
207 acpi_battery_get_state(battery);
208 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
209 return -ENODEV;
210 switch (psp) {
211 case POWER_SUPPLY_PROP_STATUS:
212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
213 val->intval = acpi_battery_handle_discharging(battery);
214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
215 val->intval = POWER_SUPPLY_STATUS_CHARGING;
216 else if (acpi_battery_is_charged(battery))
217 val->intval = POWER_SUPPLY_STATUS_FULL;
218 else
219 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
220 break;
221 case POWER_SUPPLY_PROP_PRESENT:
222 val->intval = acpi_battery_present(battery);
223 break;
224 case POWER_SUPPLY_PROP_TECHNOLOGY:
225 val->intval = acpi_battery_technology(battery);
226 break;
227 case POWER_SUPPLY_PROP_CYCLE_COUNT:
228 val->intval = battery->cycle_count;
229 break;
230 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
231 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
232 ret = -ENODEV;
233 else
234 val->intval = battery->design_voltage * 1000;
235 break;
236 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
237 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
238 ret = -ENODEV;
239 else
240 val->intval = battery->voltage_now * 1000;
241 break;
242 case POWER_SUPPLY_PROP_CURRENT_NOW:
243 case POWER_SUPPLY_PROP_POWER_NOW:
244 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
245 ret = -ENODEV;
246 else
247 val->intval = battery->rate_now * 1000;
248 break;
249 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
250 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
251 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
252 ret = -ENODEV;
253 else
254 val->intval = battery->design_capacity * 1000;
255 break;
256 case POWER_SUPPLY_PROP_CHARGE_FULL:
257 case POWER_SUPPLY_PROP_ENERGY_FULL:
258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
259 ret = -ENODEV;
260 else
261 val->intval = battery->full_charge_capacity * 1000;
262 break;
263 case POWER_SUPPLY_PROP_CHARGE_NOW:
264 case POWER_SUPPLY_PROP_ENERGY_NOW:
265 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
266 ret = -ENODEV;
267 else
268 val->intval = battery->capacity_now * 1000;
269 break;
270 case POWER_SUPPLY_PROP_CAPACITY:
271 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
272 full_capacity = battery->full_charge_capacity;
273 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
274 full_capacity = battery->design_capacity;
275
276 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
277 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
278 ret = -ENODEV;
279 else
280 val->intval = battery->capacity_now * 100/
281 full_capacity;
282 break;
283 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
284 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
286 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
287 (battery->capacity_now <= battery->alarm))
288 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
289 else if (acpi_battery_is_charged(battery))
290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
291 else
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
293 break;
294 case POWER_SUPPLY_PROP_MODEL_NAME:
295 val->strval = battery->model_number;
296 break;
297 case POWER_SUPPLY_PROP_MANUFACTURER:
298 val->strval = battery->oem_info;
299 break;
300 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
301 val->strval = battery->serial_number;
302 break;
303 default:
304 ret = -EINVAL;
305 }
306 return ret;
307}
308
309static enum power_supply_property charge_battery_props[] = {
310 POWER_SUPPLY_PROP_STATUS,
311 POWER_SUPPLY_PROP_PRESENT,
312 POWER_SUPPLY_PROP_TECHNOLOGY,
313 POWER_SUPPLY_PROP_CYCLE_COUNT,
314 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
315 POWER_SUPPLY_PROP_VOLTAGE_NOW,
316 POWER_SUPPLY_PROP_CURRENT_NOW,
317 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
318 POWER_SUPPLY_PROP_CHARGE_FULL,
319 POWER_SUPPLY_PROP_CHARGE_NOW,
320 POWER_SUPPLY_PROP_CAPACITY,
321 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
322 POWER_SUPPLY_PROP_MODEL_NAME,
323 POWER_SUPPLY_PROP_MANUFACTURER,
324 POWER_SUPPLY_PROP_SERIAL_NUMBER,
325};
326
327static enum power_supply_property charge_battery_full_cap_broken_props[] = {
328 POWER_SUPPLY_PROP_STATUS,
329 POWER_SUPPLY_PROP_PRESENT,
330 POWER_SUPPLY_PROP_TECHNOLOGY,
331 POWER_SUPPLY_PROP_CYCLE_COUNT,
332 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
333 POWER_SUPPLY_PROP_VOLTAGE_NOW,
334 POWER_SUPPLY_PROP_CURRENT_NOW,
335 POWER_SUPPLY_PROP_CHARGE_NOW,
336 POWER_SUPPLY_PROP_MODEL_NAME,
337 POWER_SUPPLY_PROP_MANUFACTURER,
338 POWER_SUPPLY_PROP_SERIAL_NUMBER,
339};
340
341static enum power_supply_property energy_battery_props[] = {
342 POWER_SUPPLY_PROP_STATUS,
343 POWER_SUPPLY_PROP_PRESENT,
344 POWER_SUPPLY_PROP_TECHNOLOGY,
345 POWER_SUPPLY_PROP_CYCLE_COUNT,
346 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
347 POWER_SUPPLY_PROP_VOLTAGE_NOW,
348 POWER_SUPPLY_PROP_POWER_NOW,
349 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
350 POWER_SUPPLY_PROP_ENERGY_FULL,
351 POWER_SUPPLY_PROP_ENERGY_NOW,
352 POWER_SUPPLY_PROP_CAPACITY,
353 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
354 POWER_SUPPLY_PROP_MODEL_NAME,
355 POWER_SUPPLY_PROP_MANUFACTURER,
356 POWER_SUPPLY_PROP_SERIAL_NUMBER,
357};
358
359static enum power_supply_property energy_battery_full_cap_broken_props[] = {
360 POWER_SUPPLY_PROP_STATUS,
361 POWER_SUPPLY_PROP_PRESENT,
362 POWER_SUPPLY_PROP_TECHNOLOGY,
363 POWER_SUPPLY_PROP_CYCLE_COUNT,
364 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
365 POWER_SUPPLY_PROP_VOLTAGE_NOW,
366 POWER_SUPPLY_PROP_POWER_NOW,
367 POWER_SUPPLY_PROP_ENERGY_NOW,
368 POWER_SUPPLY_PROP_MODEL_NAME,
369 POWER_SUPPLY_PROP_MANUFACTURER,
370 POWER_SUPPLY_PROP_SERIAL_NUMBER,
371};
372
373/* Battery Management */
374struct acpi_offsets {
375 size_t offset; /* offset inside struct acpi_sbs_battery */
376 u8 mode; /* int or string? */
377};
378
379static const struct acpi_offsets state_offsets[] = {
380 {offsetof(struct acpi_battery, state), 0},
381 {offsetof(struct acpi_battery, rate_now), 0},
382 {offsetof(struct acpi_battery, capacity_now), 0},
383 {offsetof(struct acpi_battery, voltage_now), 0},
384};
385
386static const struct acpi_offsets info_offsets[] = {
387 {offsetof(struct acpi_battery, power_unit), 0},
388 {offsetof(struct acpi_battery, design_capacity), 0},
389 {offsetof(struct acpi_battery, full_charge_capacity), 0},
390 {offsetof(struct acpi_battery, technology), 0},
391 {offsetof(struct acpi_battery, design_voltage), 0},
392 {offsetof(struct acpi_battery, design_capacity_warning), 0},
393 {offsetof(struct acpi_battery, design_capacity_low), 0},
394 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
395 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
396 {offsetof(struct acpi_battery, model_number), 1},
397 {offsetof(struct acpi_battery, serial_number), 1},
398 {offsetof(struct acpi_battery, type), 1},
399 {offsetof(struct acpi_battery, oem_info), 1},
400};
401
402static const struct acpi_offsets extended_info_offsets[] = {
403 {offsetof(struct acpi_battery, revision), 0},
404 {offsetof(struct acpi_battery, power_unit), 0},
405 {offsetof(struct acpi_battery, design_capacity), 0},
406 {offsetof(struct acpi_battery, full_charge_capacity), 0},
407 {offsetof(struct acpi_battery, technology), 0},
408 {offsetof(struct acpi_battery, design_voltage), 0},
409 {offsetof(struct acpi_battery, design_capacity_warning), 0},
410 {offsetof(struct acpi_battery, design_capacity_low), 0},
411 {offsetof(struct acpi_battery, cycle_count), 0},
412 {offsetof(struct acpi_battery, measurement_accuracy), 0},
413 {offsetof(struct acpi_battery, max_sampling_time), 0},
414 {offsetof(struct acpi_battery, min_sampling_time), 0},
415 {offsetof(struct acpi_battery, max_averaging_interval), 0},
416 {offsetof(struct acpi_battery, min_averaging_interval), 0},
417 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
418 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
419 {offsetof(struct acpi_battery, model_number), 1},
420 {offsetof(struct acpi_battery, serial_number), 1},
421 {offsetof(struct acpi_battery, type), 1},
422 {offsetof(struct acpi_battery, oem_info), 1},
423};
424
425static int extract_package(struct acpi_battery *battery,
426 union acpi_object *package,
427 const struct acpi_offsets *offsets, int num)
428{
429 int i;
430 union acpi_object *element;
431
432 if (package->type != ACPI_TYPE_PACKAGE)
433 return -EFAULT;
434 for (i = 0; i < num; ++i) {
435 if (package->package.count <= i)
436 return -EFAULT;
437 element = &package->package.elements[i];
438 if (offsets[i].mode) {
439 u8 *ptr = (u8 *)battery + offsets[i].offset;
440
441 if (element->type == ACPI_TYPE_STRING ||
442 element->type == ACPI_TYPE_BUFFER)
443 strncpy(ptr, element->string.pointer, 32);
444 else if (element->type == ACPI_TYPE_INTEGER) {
445 strncpy(ptr, (u8 *)&element->integer.value,
446 sizeof(u64));
447 ptr[sizeof(u64)] = 0;
448 } else
449 *ptr = 0; /* don't have value */
450 } else {
451 int *x = (int *)((u8 *)battery + offsets[i].offset);
452 *x = (element->type == ACPI_TYPE_INTEGER) ?
453 element->integer.value : -1;
454 }
455 }
456 return 0;
457}
458
459static int acpi_battery_get_status(struct acpi_battery *battery)
460{
461 if (acpi_bus_get_status(battery->device)) {
462 acpi_handle_info(battery->device->handle,
463 "_STA evaluation failed\n");
464 return -ENODEV;
465 }
466 return 0;
467}
468
469
470static int extract_battery_info(const int use_bix,
471 struct acpi_battery *battery,
472 const struct acpi_buffer *buffer)
473{
474 int result = -EFAULT;
475
476 if (use_bix && battery_bix_broken_package)
477 result = extract_package(battery, buffer->pointer,
478 extended_info_offsets + 1,
479 ARRAY_SIZE(extended_info_offsets) - 1);
480 else if (use_bix)
481 result = extract_package(battery, buffer->pointer,
482 extended_info_offsets,
483 ARRAY_SIZE(extended_info_offsets));
484 else
485 result = extract_package(battery, buffer->pointer,
486 info_offsets, ARRAY_SIZE(info_offsets));
487 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
488 battery->full_charge_capacity = battery->design_capacity;
489 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
490 battery->power_unit && battery->design_voltage) {
491 battery->design_capacity = battery->design_capacity *
492 10000 / battery->design_voltage;
493 battery->full_charge_capacity = battery->full_charge_capacity *
494 10000 / battery->design_voltage;
495 battery->design_capacity_warning =
496 battery->design_capacity_warning *
497 10000 / battery->design_voltage;
498 /* Curiously, design_capacity_low, unlike the rest of them,
499 * is correct.
500 */
501 /* capacity_granularity_* equal 1 on the systems tested, so
502 * it's impossible to tell if they would need an adjustment
503 * or not if their values were higher.
504 */
505 }
506 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
507 battery->capacity_now > battery->full_charge_capacity)
508 battery->capacity_now = battery->full_charge_capacity;
509
510 return result;
511}
512
513static int acpi_battery_get_info(struct acpi_battery *battery)
514{
515 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
516 int use_bix;
517 int result = -ENODEV;
518
519 if (!acpi_battery_present(battery))
520 return 0;
521
522
523 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
524 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
525 acpi_status status = AE_ERROR;
526
527 mutex_lock(&battery->lock);
528 status = acpi_evaluate_object(battery->device->handle,
529 use_bix ? "_BIX":"_BIF",
530 NULL, &buffer);
531 mutex_unlock(&battery->lock);
532
533 if (ACPI_FAILURE(status)) {
534 acpi_handle_info(battery->device->handle,
535 "%s evaluation failed: %s\n",
536 use_bix ? "_BIX":"_BIF",
537 acpi_format_exception(status));
538 } else {
539 result = extract_battery_info(use_bix,
540 battery,
541 &buffer);
542
543 kfree(buffer.pointer);
544 break;
545 }
546 }
547
548 if (!result && !use_bix && xinfo)
549 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
550
551 return result;
552}
553
554static int acpi_battery_get_state(struct acpi_battery *battery)
555{
556 int result = 0;
557 acpi_status status = 0;
558 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
559
560 if (!acpi_battery_present(battery))
561 return 0;
562
563 if (battery->update_time &&
564 time_before(jiffies, battery->update_time +
565 msecs_to_jiffies(cache_time)))
566 return 0;
567
568 mutex_lock(&battery->lock);
569 status = acpi_evaluate_object(battery->device->handle, "_BST",
570 NULL, &buffer);
571 mutex_unlock(&battery->lock);
572
573 if (ACPI_FAILURE(status)) {
574 acpi_handle_info(battery->device->handle,
575 "_BST evaluation failed: %s",
576 acpi_format_exception(status));
577 return -ENODEV;
578 }
579
580 result = extract_package(battery, buffer.pointer,
581 state_offsets, ARRAY_SIZE(state_offsets));
582 battery->update_time = jiffies;
583 kfree(buffer.pointer);
584
585 /* For buggy DSDTs that report negative 16-bit values for either
586 * charging or discharging current and/or report 0 as 65536
587 * due to bad math.
588 */
589 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
590 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
591 (s16)(battery->rate_now) < 0) {
592 battery->rate_now = abs((s16)battery->rate_now);
593 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
594 }
595
596 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
597 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
598 battery->capacity_now = (battery->capacity_now *
599 battery->full_charge_capacity) / 100;
600 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
601 battery->power_unit && battery->design_voltage) {
602 battery->capacity_now = battery->capacity_now *
603 10000 / battery->design_voltage;
604 }
605 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
606 battery->capacity_now > battery->full_charge_capacity)
607 battery->capacity_now = battery->full_charge_capacity;
608
609 return result;
610}
611
612static int acpi_battery_set_alarm(struct acpi_battery *battery)
613{
614 acpi_status status = 0;
615
616 if (!acpi_battery_present(battery) ||
617 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
618 return -ENODEV;
619
620 mutex_lock(&battery->lock);
621 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
622 battery->alarm);
623 mutex_unlock(&battery->lock);
624
625 if (ACPI_FAILURE(status))
626 return -ENODEV;
627
628 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
629 battery->alarm);
630
631 return 0;
632}
633
634static int acpi_battery_init_alarm(struct acpi_battery *battery)
635{
636 /* See if alarms are supported, and if so, set default */
637 if (!acpi_has_method(battery->device->handle, "_BTP")) {
638 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
639 return 0;
640 }
641 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
642 if (!battery->alarm)
643 battery->alarm = battery->design_capacity_warning;
644 return acpi_battery_set_alarm(battery);
645}
646
647static ssize_t acpi_battery_alarm_show(struct device *dev,
648 struct device_attribute *attr,
649 char *buf)
650{
651 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
652
653 return sprintf(buf, "%d\n", battery->alarm * 1000);
654}
655
656static ssize_t acpi_battery_alarm_store(struct device *dev,
657 struct device_attribute *attr,
658 const char *buf, size_t count)
659{
660 unsigned long x;
661 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
662
663 if (sscanf(buf, "%lu\n", &x) == 1)
664 battery->alarm = x/1000;
665 if (acpi_battery_present(battery))
666 acpi_battery_set_alarm(battery);
667 return count;
668}
669
670static const struct device_attribute alarm_attr = {
671 .attr = {.name = "alarm", .mode = 0644},
672 .show = acpi_battery_alarm_show,
673 .store = acpi_battery_alarm_store,
674};
675
676/*
677 * The Battery Hooking API
678 *
679 * This API is used inside other drivers that need to expose
680 * platform-specific behaviour within the generic driver in a
681 * generic way.
682 *
683 */
684
685static LIST_HEAD(acpi_battery_list);
686static LIST_HEAD(battery_hook_list);
687static DEFINE_MUTEX(hook_mutex);
688
689static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
690{
691 struct acpi_battery *battery;
692 /*
693 * In order to remove a hook, we first need to
694 * de-register all the batteries that are registered.
695 */
696 if (lock)
697 mutex_lock(&hook_mutex);
698 list_for_each_entry(battery, &acpi_battery_list, list) {
699 if (!hook->remove_battery(battery->bat, hook))
700 power_supply_changed(battery->bat);
701 }
702 list_del(&hook->list);
703 if (lock)
704 mutex_unlock(&hook_mutex);
705 pr_info("extension unregistered: %s\n", hook->name);
706}
707
708void battery_hook_unregister(struct acpi_battery_hook *hook)
709{
710 __battery_hook_unregister(hook, 1);
711}
712EXPORT_SYMBOL_GPL(battery_hook_unregister);
713
714void battery_hook_register(struct acpi_battery_hook *hook)
715{
716 struct acpi_battery *battery;
717
718 mutex_lock(&hook_mutex);
719 INIT_LIST_HEAD(&hook->list);
720 list_add(&hook->list, &battery_hook_list);
721 /*
722 * Now that the driver is registered, we need
723 * to notify the hook that a battery is available
724 * for each battery, so that the driver may add
725 * its attributes.
726 */
727 list_for_each_entry(battery, &acpi_battery_list, list) {
728 if (hook->add_battery(battery->bat, hook)) {
729 /*
730 * If a add-battery returns non-zero,
731 * the registration of the extension has failed,
732 * and we will not add it to the list of loaded
733 * hooks.
734 */
735 pr_err("extension failed to load: %s", hook->name);
736 __battery_hook_unregister(hook, 0);
737 goto end;
738 }
739
740 power_supply_changed(battery->bat);
741 }
742 pr_info("new extension: %s\n", hook->name);
743end:
744 mutex_unlock(&hook_mutex);
745}
746EXPORT_SYMBOL_GPL(battery_hook_register);
747
748/*
749 * This function gets called right after the battery sysfs
750 * attributes have been added, so that the drivers that
751 * define custom sysfs attributes can add their own.
752 */
753static void battery_hook_add_battery(struct acpi_battery *battery)
754{
755 struct acpi_battery_hook *hook_node, *tmp;
756
757 mutex_lock(&hook_mutex);
758 INIT_LIST_HEAD(&battery->list);
759 list_add(&battery->list, &acpi_battery_list);
760 /*
761 * Since we added a new battery to the list, we need to
762 * iterate over the hooks and call add_battery for each
763 * hook that was registered. This usually happens
764 * when a battery gets hotplugged or initialized
765 * during the battery module initialization.
766 */
767 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
768 if (hook_node->add_battery(battery->bat, hook_node)) {
769 /*
770 * The notification of the extensions has failed, to
771 * prevent further errors we will unload the extension.
772 */
773 pr_err("error in extension, unloading: %s",
774 hook_node->name);
775 __battery_hook_unregister(hook_node, 0);
776 }
777 }
778 mutex_unlock(&hook_mutex);
779}
780
781static void battery_hook_remove_battery(struct acpi_battery *battery)
782{
783 struct acpi_battery_hook *hook;
784
785 mutex_lock(&hook_mutex);
786 /*
787 * Before removing the hook, we need to remove all
788 * custom attributes from the battery.
789 */
790 list_for_each_entry(hook, &battery_hook_list, list) {
791 hook->remove_battery(battery->bat, hook);
792 }
793 /* Then, just remove the battery from the list */
794 list_del(&battery->list);
795 mutex_unlock(&hook_mutex);
796}
797
798static void __exit battery_hook_exit(void)
799{
800 struct acpi_battery_hook *hook;
801 struct acpi_battery_hook *ptr;
802 /*
803 * At this point, the acpi_bus_unregister_driver()
804 * has called remove for all batteries. We just
805 * need to remove the hooks.
806 */
807 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
808 __battery_hook_unregister(hook, 1);
809 }
810 mutex_destroy(&hook_mutex);
811}
812
813static int sysfs_add_battery(struct acpi_battery *battery)
814{
815 struct power_supply_config psy_cfg = { .drv_data = battery, };
816 bool full_cap_broken = false;
817
818 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
819 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
820 full_cap_broken = true;
821
822 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
823 if (full_cap_broken) {
824 battery->bat_desc.properties =
825 charge_battery_full_cap_broken_props;
826 battery->bat_desc.num_properties =
827 ARRAY_SIZE(charge_battery_full_cap_broken_props);
828 } else {
829 battery->bat_desc.properties = charge_battery_props;
830 battery->bat_desc.num_properties =
831 ARRAY_SIZE(charge_battery_props);
832 }
833 } else {
834 if (full_cap_broken) {
835 battery->bat_desc.properties =
836 energy_battery_full_cap_broken_props;
837 battery->bat_desc.num_properties =
838 ARRAY_SIZE(energy_battery_full_cap_broken_props);
839 } else {
840 battery->bat_desc.properties = energy_battery_props;
841 battery->bat_desc.num_properties =
842 ARRAY_SIZE(energy_battery_props);
843 }
844 }
845
846 battery->bat_desc.name = acpi_device_bid(battery->device);
847 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
848 battery->bat_desc.get_property = acpi_battery_get_property;
849
850 battery->bat = power_supply_register_no_ws(&battery->device->dev,
851 &battery->bat_desc, &psy_cfg);
852
853 if (IS_ERR(battery->bat)) {
854 int result = PTR_ERR(battery->bat);
855
856 battery->bat = NULL;
857 return result;
858 }
859 battery_hook_add_battery(battery);
860 return device_create_file(&battery->bat->dev, &alarm_attr);
861}
862
863static void sysfs_remove_battery(struct acpi_battery *battery)
864{
865 mutex_lock(&battery->sysfs_lock);
866 if (!battery->bat) {
867 mutex_unlock(&battery->sysfs_lock);
868 return;
869 }
870 battery_hook_remove_battery(battery);
871 device_remove_file(&battery->bat->dev, &alarm_attr);
872 power_supply_unregister(battery->bat);
873 battery->bat = NULL;
874 mutex_unlock(&battery->sysfs_lock);
875}
876
877static void find_battery(const struct dmi_header *dm, void *private)
878{
879 struct acpi_battery *battery = (struct acpi_battery *)private;
880 /* Note: the hardcoded offsets below have been extracted from
881 * the source code of dmidecode.
882 */
883 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
884 const u8 *dmi_data = (const u8 *)(dm + 1);
885 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
886
887 if (dm->length >= 18)
888 dmi_capacity *= dmi_data[17];
889 if (battery->design_capacity * battery->design_voltage / 1000
890 != dmi_capacity &&
891 battery->design_capacity * 10 == dmi_capacity)
892 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
893 &battery->flags);
894 }
895}
896
897/*
898 * According to the ACPI spec, some kinds of primary batteries can
899 * report percentage battery remaining capacity directly to OS.
900 * In this case, it reports the Last Full Charged Capacity == 100
901 * and BatteryPresentRate == 0xFFFFFFFF.
902 *
903 * Now we found some battery reports percentage remaining capacity
904 * even if it's rechargeable.
905 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
906 *
907 * Handle this correctly so that they won't break userspace.
908 */
909static void acpi_battery_quirks(struct acpi_battery *battery)
910{
911 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
912 return;
913
914 if (battery->full_charge_capacity == 100 &&
915 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
916 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
917 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
918 battery->full_charge_capacity = battery->design_capacity;
919 battery->capacity_now = (battery->capacity_now *
920 battery->full_charge_capacity) / 100;
921 }
922
923 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
924 return;
925
926 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
927 const char *s;
928
929 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
930 if (s && !strncasecmp(s, "ThinkPad", 8)) {
931 dmi_walk(find_battery, battery);
932 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
933 &battery->flags) &&
934 battery->design_voltage) {
935 battery->design_capacity =
936 battery->design_capacity *
937 10000 / battery->design_voltage;
938 battery->full_charge_capacity =
939 battery->full_charge_capacity *
940 10000 / battery->design_voltage;
941 battery->design_capacity_warning =
942 battery->design_capacity_warning *
943 10000 / battery->design_voltage;
944 battery->capacity_now = battery->capacity_now *
945 10000 / battery->design_voltage;
946 }
947 }
948 }
949
950 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
951 return;
952
953 if (acpi_battery_is_degraded(battery) &&
954 battery->capacity_now > battery->full_charge_capacity) {
955 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
956 battery->capacity_now = battery->full_charge_capacity;
957 }
958}
959
960static int acpi_battery_update(struct acpi_battery *battery, bool resume)
961{
962 int result = acpi_battery_get_status(battery);
963
964 if (result)
965 return result;
966
967 if (!acpi_battery_present(battery)) {
968 sysfs_remove_battery(battery);
969 battery->update_time = 0;
970 return 0;
971 }
972
973 if (resume)
974 return 0;
975
976 if (!battery->update_time) {
977 result = acpi_battery_get_info(battery);
978 if (result)
979 return result;
980 acpi_battery_init_alarm(battery);
981 }
982
983 result = acpi_battery_get_state(battery);
984 if (result)
985 return result;
986 acpi_battery_quirks(battery);
987
988 if (!battery->bat) {
989 result = sysfs_add_battery(battery);
990 if (result)
991 return result;
992 }
993
994 /*
995 * Wakeup the system if battery is critical low
996 * or lower than the alarm level
997 */
998 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
999 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1000 (battery->capacity_now <= battery->alarm)))
1001 acpi_pm_wakeup_event(&battery->device->dev);
1002
1003 return result;
1004}
1005
1006static void acpi_battery_refresh(struct acpi_battery *battery)
1007{
1008 int power_unit;
1009
1010 if (!battery->bat)
1011 return;
1012
1013 power_unit = battery->power_unit;
1014
1015 acpi_battery_get_info(battery);
1016
1017 if (power_unit == battery->power_unit)
1018 return;
1019
1020 /* The battery has changed its reporting units. */
1021 sysfs_remove_battery(battery);
1022 sysfs_add_battery(battery);
1023}
1024
1025/* Driver Interface */
1026static void acpi_battery_notify(struct acpi_device *device, u32 event)
1027{
1028 struct acpi_battery *battery = acpi_driver_data(device);
1029 struct power_supply *old;
1030
1031 if (!battery)
1032 return;
1033 old = battery->bat;
1034 /*
1035 * On Acer Aspire V5-573G notifications are sometimes triggered too
1036 * early. For example, when AC is unplugged and notification is
1037 * triggered, battery state is still reported as "Full", and changes to
1038 * "Discharging" only after short delay, without any notification.
1039 */
1040 if (battery_notification_delay_ms > 0)
1041 msleep(battery_notification_delay_ms);
1042 if (event == ACPI_BATTERY_NOTIFY_INFO)
1043 acpi_battery_refresh(battery);
1044 acpi_battery_update(battery, false);
1045 acpi_bus_generate_netlink_event(device->pnp.device_class,
1046 dev_name(&device->dev), event,
1047 acpi_battery_present(battery));
1048 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1049 /* acpi_battery_update could remove power_supply object */
1050 if (old && battery->bat)
1051 power_supply_changed(battery->bat);
1052}
1053
1054static int battery_notify(struct notifier_block *nb,
1055 unsigned long mode, void *_unused)
1056{
1057 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1058 pm_nb);
1059 int result;
1060
1061 switch (mode) {
1062 case PM_POST_HIBERNATION:
1063 case PM_POST_SUSPEND:
1064 if (!acpi_battery_present(battery))
1065 return 0;
1066
1067 if (battery->bat) {
1068 acpi_battery_refresh(battery);
1069 } else {
1070 result = acpi_battery_get_info(battery);
1071 if (result)
1072 return result;
1073
1074 result = sysfs_add_battery(battery);
1075 if (result)
1076 return result;
1077 }
1078
1079 acpi_battery_init_alarm(battery);
1080 acpi_battery_get_state(battery);
1081 break;
1082 }
1083
1084 return 0;
1085}
1086
1087static int __init
1088battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1089{
1090 battery_bix_broken_package = 1;
1091 return 0;
1092}
1093
1094static int __init
1095battery_notification_delay_quirk(const struct dmi_system_id *d)
1096{
1097 battery_notification_delay_ms = 1000;
1098 return 0;
1099}
1100
1101static int __init
1102battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1103{
1104 battery_ac_is_broken = 1;
1105 return 0;
1106}
1107
1108static const struct dmi_system_id bat_dmi_table[] __initconst = {
1109 {
1110 /* NEC LZ750/LS */
1111 .callback = battery_bix_broken_package_quirk,
1112 .matches = {
1113 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1114 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1115 },
1116 },
1117 {
1118 /* Acer Aspire V5-573G */
1119 .callback = battery_notification_delay_quirk,
1120 .matches = {
1121 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1122 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1123 },
1124 },
1125 {
1126 /* Point of View mobii wintab p800w */
1127 .callback = battery_ac_is_broken_quirk,
1128 .matches = {
1129 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1130 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1131 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1132 /* Above matches are too generic, add bios-date match */
1133 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1134 },
1135 },
1136 {
1137 /* Microsoft Surface Go 3 */
1138 .callback = battery_notification_delay_quirk,
1139 .matches = {
1140 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1141 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1142 },
1143 },
1144 {},
1145};
1146
1147/*
1148 * Some machines'(E,G Lenovo Z480) ECs are not stable
1149 * during boot up and this causes battery driver fails to be
1150 * probed due to failure of getting battery information
1151 * from EC sometimes. After several retries, the operation
1152 * may work. So add retry code here and 20ms sleep between
1153 * every retries.
1154 */
1155static int acpi_battery_update_retry(struct acpi_battery *battery)
1156{
1157 int retry, ret;
1158
1159 for (retry = 5; retry; retry--) {
1160 ret = acpi_battery_update(battery, false);
1161 if (!ret)
1162 break;
1163
1164 msleep(20);
1165 }
1166 return ret;
1167}
1168
1169static int acpi_battery_add(struct acpi_device *device)
1170{
1171 int result = 0;
1172 struct acpi_battery *battery = NULL;
1173
1174 if (!device)
1175 return -EINVAL;
1176
1177 if (device->dep_unmet)
1178 return -EPROBE_DEFER;
1179
1180 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1181 if (!battery)
1182 return -ENOMEM;
1183 battery->device = device;
1184 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1185 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1186 device->driver_data = battery;
1187 mutex_init(&battery->lock);
1188 mutex_init(&battery->sysfs_lock);
1189 if (acpi_has_method(battery->device->handle, "_BIX"))
1190 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1191
1192 result = acpi_battery_update_retry(battery);
1193 if (result)
1194 goto fail;
1195
1196 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1197 device->status.battery_present ? "present" : "absent");
1198
1199 battery->pm_nb.notifier_call = battery_notify;
1200 register_pm_notifier(&battery->pm_nb);
1201
1202 device_init_wakeup(&device->dev, 1);
1203
1204 return result;
1205
1206fail:
1207 sysfs_remove_battery(battery);
1208 mutex_destroy(&battery->lock);
1209 mutex_destroy(&battery->sysfs_lock);
1210 kfree(battery);
1211 return result;
1212}
1213
1214static void acpi_battery_remove(struct acpi_device *device)
1215{
1216 struct acpi_battery *battery = NULL;
1217
1218 if (!device || !acpi_driver_data(device))
1219 return;
1220 device_init_wakeup(&device->dev, 0);
1221 battery = acpi_driver_data(device);
1222 unregister_pm_notifier(&battery->pm_nb);
1223 sysfs_remove_battery(battery);
1224 mutex_destroy(&battery->lock);
1225 mutex_destroy(&battery->sysfs_lock);
1226 kfree(battery);
1227}
1228
1229#ifdef CONFIG_PM_SLEEP
1230/* this is needed to learn about changes made in suspended state */
1231static int acpi_battery_resume(struct device *dev)
1232{
1233 struct acpi_battery *battery;
1234
1235 if (!dev)
1236 return -EINVAL;
1237
1238 battery = acpi_driver_data(to_acpi_device(dev));
1239 if (!battery)
1240 return -EINVAL;
1241
1242 battery->update_time = 0;
1243 acpi_battery_update(battery, true);
1244 return 0;
1245}
1246#else
1247#define acpi_battery_resume NULL
1248#endif
1249
1250static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1251
1252static struct acpi_driver acpi_battery_driver = {
1253 .name = "battery",
1254 .class = ACPI_BATTERY_CLASS,
1255 .ids = battery_device_ids,
1256 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1257 .ops = {
1258 .add = acpi_battery_add,
1259 .remove = acpi_battery_remove,
1260 .notify = acpi_battery_notify,
1261 },
1262 .drv.pm = &acpi_battery_pm,
1263};
1264
1265static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1266{
1267 int result;
1268
1269 if (acpi_quirk_skip_acpi_ac_and_battery())
1270 return;
1271
1272 dmi_check_system(bat_dmi_table);
1273
1274 result = acpi_bus_register_driver(&acpi_battery_driver);
1275 battery_driver_registered = (result == 0);
1276}
1277
1278static int __init acpi_battery_init(void)
1279{
1280 if (acpi_disabled)
1281 return -ENODEV;
1282
1283 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1284 return 0;
1285}
1286
1287static void __exit acpi_battery_exit(void)
1288{
1289 async_synchronize_cookie(async_cookie + 1);
1290 if (battery_driver_registered) {
1291 acpi_bus_unregister_driver(&acpi_battery_driver);
1292 battery_hook_exit();
1293 }
1294}
1295
1296module_init(acpi_battery_init);
1297module_exit(acpi_battery_exit);